What are the criteria? Well, that's the question, isn't it? To qualify, you must:

Buy a new smartphone with no down payment with the AT&T Next early upgrade program.

Bring a separate off-contract device.

Buy a smartphone at full retail price.

Switch to a new plan after a phone is no longer under contract.

The carrier notes that, "Consumers will have the ability to connect up to 10 devices, including tablets and other wireless devices, while business customers will be able to connect up to 10, 15, 20 or 25 devices, depending on the plan." The whole thing kicks off on December 8. If you're shopping and you fit somewhere in the list above, give it some consideration.